Throttle By Wire.. What a Shame...
Elite HDF Member
Joined: Apr 2009
Posts: 3,780
Likes: 69
From: Al Bu Ker Key, New Mexico
Hey All.. I have a '10 RKP.. Love it, great bike, great frame, etc.. But I just can't stand the Throttle by Wire.. I had a 1200 sportster carburated years back and the throttle response was like a fire cracker blast.. Now even with impressive engine numbers, the throttle response isn't what I had hoped.. Does anyone else notice this, and if so, is there a remedy? My indie said that the delay that is because the throttle sensor has to travel the message to the computer then to engine to produce response and is lagged.. ARgh..
Ultimate HDF Member
Joined: May 2008
Posts: 6,508
Likes: 169
From: WPB, FL
Just My .02
Guess I'm lucky? Never had a throttle response issue.
I have found firsthand that the response (or lack of) on the DBW bikes is just as much or much more related to the factory tuning itself rather than the DBW system itself. It is combination of lean mixture, excessive accelleration enrichment, and less than optimum ignition timing in the stock calibration all combined together. The ECM also uses various strategies as forms of torque management to help with driveline lash and off idle low RPM abruptness. When the fuel tables and igntion timing are properly tuned throttle response is generally very acceptable even with the base throttle table, however there are several products as noted earler such as Dynojet Power Vision, SE Pro Race Tuner, and TTS that allow you to adjust the throttle blade (Power Vision even gives you 2 tables to adjust this with). I have hundreds of logs of the throttle blade strategies on drive by wire bikes and have adjusted the throttle tables all over the place monitoring the results using the factory and aftermarket calibration (for reference most aftermarket calibrations actually use the same throttle blade base settings as stock) I do agree that the ability to adjust the throttle blade tables is very helpful when needed and in some application have made very measureable results, however if you have any of these products before making any big adjustments to the throttle tables I recommend doing some data recording and logging MAP, TPS, and Twist Grip position and this will really help understand the strategy. It is also important to unserdtand that because the throttle blade directly affects manifold pressure that changing the throttle blade settings can and will directly affect the other tables in the tune as the Delphi speed density system uses manifold pressure and intake air temp to determine air mass. Hope this info helps........
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Jamie Long / Fuel Moto USA
The USA's Leader V-Twin EFI & Performance www.fuelmotousa.com
Contact 920-423-3309
Email jamie@fuelmotousa.com
Jamie Long / Fuel Moto USA
The USA's Leader V-Twin EFI & Performance www.fuelmotousa.com
Contact 920-423-3309
Email jamie@fuelmotousa.com
Supporter
Joined: Mar 2011
Posts: 587
Likes: 1
From: Ga.
The TTS is a programmer, is does not get "installed" you connect it to the ECM and re-program the ECM, then you remove the TTS and put it away. It does not stay connected like some other modules.
Road Warrior
Joined: Oct 2006
Posts: 1,331
Likes: 4
From: South Jersey, AC area
but it is fast merely because the wire is already filled with electrons, so the action is near instantaneous..
think of a copper wire as a pipe completely filled with water, then forcing a drop of water in one end will result in a drop at the other end being pushed out very quickly.
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Elite HDF Member
Joined: Nov 2010
Posts: 3,846
Likes: 173
From: Simi Valley, CA
it does not move at the speed of light.. because we are not using fiberoptics.
but it is fast merely because the wire is already filled with electrons, so the action is near instantaneous..
think of a copper wire as a pipe completely filled with water, then forcing a drop of water in one end will result in a drop at the other end being pushed out very quickly.
but it is fast merely because the wire is already filled with electrons, so the action is near instantaneous..
think of a copper wire as a pipe completely filled with water, then forcing a drop of water in one end will result in a drop at the other end being pushed out very quickly.
